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BOGOTA, Colombia — At least one man was killed in rioting over the collapse of a pyramid scheme that offered 70 percent returns and fleeced its mostly poor investors out of millions of dollars, Colombian authorities said Thursday.

The victim was shot dead Wednesday evening in a southern cocaine-producing region where angry investors were demanding their money back from a company called "Dinero Rapido Facil Efectivo," or DRFE.

The name means "Fast Money, Easy Cash" in English.

Authorities seized 66 company offices and confiscated 14 billion pesos ($6 million), according to national police director Gen. Oscar Naranjo. He said no arrests had been made but authorities were seeking DRFE's owners.

On Tuesday, the Finance Ministry ordered DRFE to return deposits to investors. It calculated the company took in 400 billion pesos (about $180 million) from January through September.

Finance Minister Oscar Zuluaga told reporters that authorities were investigating whether DRFE was involved in laundering drug money. The Associated Press could not confirm media reports that the company's owner fled the country.

Dead man had tried to calm investors
The man killed Wednesday night, Byron Santander, was a public official who was trying to calm upset investors in Buesaco when he was shot by an unknown assailant, Mayor Jose Maria Moncayo told the AP in a telephone interview.